Abstract
The article deals with the approximation of the results of experimental measurement of coating of the inner surface of slim pipes with special oil, using a dispersion oil fraction. The reason for such treatment of the inner surface of the tubes is the anti-corrosion protection or various other requirements. The oil manufacturer prescribes the minimum required layer to guarantee the anti-corrosion protection parameters. Therefore, it is advisable to know the most exact coating parameters for different pipe diameters. The measured results give us an assumption of how much oil is sufficient to coat the inside of a pipe. The main idea lies in the correct estimation of coefficients in the three-parameter exponential dependence. For the initial estimates, Nelder–Mead’s minimization method was used. The condition for meeting the lower estimate of the minimum thickness of the oil layer was determined. Following graphic processing of minimization of individual pipe diameters, in some cases, the coefficients were adjusted manually. The result is that the oil thickness depends on the distance of the investigated point from the beginning of the tube, or on the point of entry of the dispersion oil fraction.
Highlights
The article describes a method of depositing a thin film of special anti corrosive material on the inner surface of slim tubes in sufficient quantity to guarantee anti corrosive protection
The measured values were processed in the tables, with calculated values of the oil film thickness in each one meter section as a radially uniformly applied layer on the inner surface of the pipe across the entire one-meter section
We assume that dividing the measured tubes into one meter long sections is sufficient for a relevant assessment of the presence of the oil film layer on their inner surface
Summary
The article describes a method of depositing a thin film of special anti corrosive material on the inner surface of slim tubes in sufficient quantity to guarantee anti corrosive protection. According to Chigondo [2] and Lgaz et al [3], simple procedures and guidelines for protection can be found in the use of corrosion inhibitors, which represent an inexpensive and effective alternative to traditional protections, Cathodic protection, incorporation of suitable alloys, efficient process control, reduction of alloy impurities and use of surface treatment techniques, etc.
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